CN216411897U - Excitation conditioning circuit - Google Patents
Excitation conditioning circuit Download PDFInfo
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- CN216411897U CN216411897U CN202122667336.1U CN202122667336U CN216411897U CN 216411897 U CN216411897 U CN 216411897U CN 202122667336 U CN202122667336 U CN 202122667336U CN 216411897 U CN216411897 U CN 216411897U
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Abstract
The utility model provides an excitation conditioning circuit, and belongs to the technical field of motors. The excitation conditioning circuit includes: a digital signal processor; the input end of the passive filter circuit is connected with the output end of the digital signal processor; the active filter circuit is connected with the output end of the passive filter circuit, and the technical problem that in an excitation conditioning circuit for a motor controller in the prior art, the anti-interference capability is poor generally, and the phase delay caused by RC (resistance-capacitance) filtering is not considered, so that the rotating speed sampling precision is influenced is solved.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to an excitation conditioning circuit.
Background
The motor controller is a core control device used for controlling the starting, running, advancing and retreating, speed and stopping of a motor of the electric vehicle and other electronic devices of the electric vehicle, is just like the brain of the electric vehicle, and is an important part on the electric vehicle, the electric vehicle mainly comprises an electric bicycle, an electric two-wheel motorcycle, an electric tricycle, an electric motor tricycle, an electric four-wheel vehicle, an accumulator vehicle and the like, and the electric vehicle becomes a part of our life along with the national strong support for the new energy electric vehicle industry.
In the prior art, a sine wave is output by a decoding chip (such as a decoding chip of the ADS 1205) of a motor controller, and then the sine wave is amplified by a reverse voltage and filtered by an RC low-pass current, and finally the sine wave is input to a rotary transformer by a power amplifying circuit.
The applicant of the present invention finds that the prior art has at least the following technical problems:
in the prior art, a sine wave is output by a decoding chip (such as a decoding chip of an ADS 1205) of a motor controller, and then the sine wave is amplified by a reverse voltage and filtered by an RC low-pass current, and finally the sine wave is input to a rotary transformer by a power amplifying circuit.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an excitation conditioning circuit, which solves the technical problems that in the prior art, an excitation conditioning circuit of a motor controller generally adopts a decoding chip (such as a decoding chip with the model number of ADS 1205) to output sine waves, then outputs sine waves through a reverse voltage amplification circuit and an RC low-pass filtering circuit, and finally inputs the sine waves to a rotary transformer through a power amplification circuit, the excitation conditioning circuit generally has poor anti-interference capability, and the phase delay caused by the RC filtering is not considered, so that the rotating speed sampling precision is influenced.
In view of the above problem, an embodiment of the present invention provides a stimulus conditioning circuit, which includes a digital signal processor; the input end of the passive filter circuit is connected with the output end of the digital signal processor; and the active filter circuit is connected with the output end of the passive filter circuit.
Preferably, the passive filter circuit comprises a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, wherein the resistor R1, the resistor R2 and the capacitor C2 are sequentially connected in series, and the capacitor C1 is connected in parallel with the resistor R1.
Preferably, the active filter circuit includes a second-order active low-pass filter circuit, a second-order active high-pass filter circuit, a second-order active band-pass circuit, and a second-order active band-stop circuit.
Preferably, the active filter circuit includes an operational amplifier U1, a common-direction input end of the operational amplifier U1 is connected to a first end of a resistor R4, a second end of the resistor R4 is connected to a resistor R3, a capacitor C3 is disposed between the resistor R3 and a resistor R4, a first end of the capacitor C3 is connected between the resistor R3 and the resistor R4, a second end of the capacitor C3 is connected to an output end of the operational amplifier U1, a first end of a capacitor C4 is further connected between the resistor R4 and the operational amplifier U1, an inverting input end of the operational amplifier U1 is connected to first ends of the resistor R5 and the resistor R6, and a second end of the resistor R6 is connected to an output end of the operational amplifier U1.
Preferably, the excitation conditioning circuit further comprises a rotary transformer, and the rotary transformer is connected with the output end of the active filter circuit.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
an excitation conditioning circuit provided in an embodiment of the present invention includes: compared with the traditional circuit, the application adopts a layer of active filter circuit arranged behind the passive filter circuit to realize the functions of strengthening filtering and anti-interference capability, and simultaneously, the active filter circuit can compensate the phase delay of the signal to improve the precision of the rotating speed sampling signal, and the application uses the digital signal processor to compare the output sine wave with the triangular wave to output square wave, thereby saving a rotary-change decoding chip and effectively reducing the manufacturing cost, thereby solving the problem that the excitation conditioning circuit of the motor controller in the prior art generally adopts a decoding chip (such as a decoding chip with the model number of ADS 1205) to output the sine wave, the excitation conditioning circuit generally has poor anti-interference capability, and does not consider phase delay caused by RC filtering, thereby influencing the technical problem of rotating speed sampling precision.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a block diagram of an excitation conditioning circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an excitation conditioning circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a filter circuit according to an embodiment of the utility model.
Description of reference numerals: 100. a digital signal processor; 200. a passive filter circuit; 300. An active filter circuit; 400. a rotary transformer.
Detailed Description
The embodiment of the utility model provides an excitation conditioning circuit, which is used for solving the technical problems that in the prior art, a decoding chip (such as a decoding chip with the model number of ADS 1205) is generally adopted by an excitation conditioning circuit of a motor controller to output sine waves, the sine waves are amplified by reverse voltage and subjected to RC low-pass filtering current, and finally the sine waves are input into a rotary transformer through a power amplifying circuit.
The technical scheme provided by the utility model has the following general idea: the excitation conditioning circuit includes: a digital signal processor 100; a passive filter circuit 200, wherein an input end of the passive filter circuit 200 is connected with an output end of the digital signal processor 100; the active filter circuit 300, the active filter circuit 300 is connected with the output end of the passive filter circuit 200, the digital signal processor 100 is used for outputting a signal after the sine wave is compared with the triangular wave, the signal is firstly filtered by the passive filter circuit 200, then phase advance compensation and voltage amplification are carried out by the active filter circuit 300, and finally the signal is input to the rotary transformer 400, compared with the traditional circuit, the active filter circuit 300 is additionally arranged behind the passive filter circuit 200, the functions of filtering enhancement and anti-interference capability are realized, meanwhile, the active filter circuit 300 can compensate the phase delay of the signal, the precision of the rotating speed sampling signal is improved, and the digital signal processor 100 is used for comparing the output square wave by using the output sine wave and the triangular wave, the rotary transformer decoding chip is saved, and the manufacturing cost is effectively reduced, therefore, the technical problem that in the prior art, a sine wave is output by a decoding chip (such as a decoding chip of an ADS 1205) of an excitation conditioning circuit of the motor controller, then the sine wave is amplified by reverse voltage and filtered by an RC low-pass current, and finally the sine wave is input to a rotary transformer by a power amplifying circuit is solved, the general anti-interference capability of the excitation conditioning circuit is poor, and the phase delay caused by the RC filtering is not considered, so that the rotating speed sampling precision is influenced.
It should be understood that, in the embodiment of the present invention, the Digital Signal Processor (english: Digital Signal Processor) is a Processor composed of large-scale or very-large-scale integrated circuit chips and used for performing Digital Signal processing tasks, Digital Signal processing is a theory and technology for digitally representing and processing signals, Digital Signal processing and analog Signal processing are subsets of Signal processing, the purpose of Digital Signal processing is to measure or filter continuous analog signals in the real world, therefore, signals need to be converted from the analog domain to the Digital domain before Digital Signal processing is performed, which is usually implemented by an analog-to-Digital converter, and the output of Digital Signal processing is often converted to the analog domain, which is implemented by a Digital-to-analog converter.
It should be understood that in the embodiment of the present invention, the filter circuit is used to select a desired signal from a plurality of signals, the passive filter circuit is divided into a passive filter circuit and an active filter circuit according to whether the circuit needs power supply or not, the passive filter circuit is mainly composed of an inductor, a capacitor and a resistor, so called RC filter circuit or LC filter circuit, the active filter circuit is a new power electronic device for dynamically suppressing harmonics and compensating reactive power, which can compensate for harmonics and reactive power that vary in magnitude and frequency, the active filter is called active, the device needs to provide power supply (to compensate for harmonics of the main circuit) as its name suggests, the application of the method can overcome the defects of traditional harmonic suppression and reactive compensation methods (traditional method only can carry out fixed compensation) such as an LC filter circuit, realize dynamic tracking compensation, and can supplement harmonic and reactive power.
It should be understood that, in the embodiment of the present invention, the operational amplifier (abbreviated as "operational amplifier") is a circuit unit with very high amplification factor, and in an actual circuit, it usually combines with a feedback network to form a certain functional module, and it is an amplifier with a special coupling circuit and feedback, and its output signal can be the result of mathematical operations such as addition, subtraction or differentiation, integration, etc. of an input signal, and since it was earlier applied to an analog computer to implement the mathematical operations, it is called "operational amplifier".
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to fig. 2, an embodiment of a stimulus conditioning circuit according to the present invention includes: digital signal processor 100, passive filter circuit 200, and active filter circuit 300.
Further, the passive filter 200 circuit includes a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, the resistor R1, the resistor R2 and the capacitor C2 are sequentially connected in series, and the capacitor C1 and the resistor R1 are connected in parallel.
Specifically, the passive filter circuit 200 is composed of two stages of RC filter circuits formed by a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, and compared with a one-stage RC filter circuit adopted in the conventional technology, the passive filter circuit has the advantages of enhanced filtering, enhanced anti-interference capability and better use effect.
Further, the active filter circuit 300 includes a second-order active low-pass filter circuit, a second-order active high-pass filter circuit, a second-order active band-pass circuit, and a second-order active band-stop circuit, that is, the active filter circuit 300 in the embodiment of the present invention may be replaced by any one of the second-order active low-pass filter circuit, the second-order active high-pass filter circuit, the second-order active band-pass circuit, and the second-order active band-stop circuit.
Further, the active filter circuit 300 includes an operational amplifier U1, a common-direction input terminal of the operational amplifier U1 is connected to a first terminal of a resistor R4, a second terminal of the resistor R4 is connected to a resistor R3, a capacitor C3 is disposed between the resistor R3 and a resistor R4, a first terminal of the capacitor C3 is connected between a resistor R3 and the resistor R4, a second terminal of the capacitor C3 is connected to an output terminal of the operational amplifier U1, a first terminal of a capacitor C4 is further connected between the resistor R4 and the operational amplifier U1, an inverting input terminal of the operational amplifier U1 is connected to first terminals of the resistor R5 and the resistor R6, and a second terminal of the resistor R6 is connected to an output terminal of the operational amplifier U1.
Specifically, the signal output by the digital signal processor 100 is an amplitude 5V square wave, the duty ratio is a comparison output of a sine wave and a triangular wave inside the digital signal processor 100, for example, as shown in fig. 2, the signal at EXC in fig. 2 is a 10khz square wave, the amplitude is 5V, the waveform output by the passive filter circuit 200 is a sine wave, and the sine wave is an input of the active filter circuit 300, wherein a voltage amplification gain is set by using a resistor R5 and a resistor R6, the operational amplifier U1 is used for power operational amplification and large current output, and the resistor R3, the resistor R4, the capacitor C3 and the capacitor C4 are loop adjusting resistor capacitors.
Further, an excitation conditioning circuit further includes a resolver 400, the resolver 400 is connected to an output end of the active filter circuit 300, and the resolver (resolver) is an electromagnetic sensor, which is also called a synchronous resolver. The small AC motor is used to measure angular displacement and speed of rotating shaft of rotating object and consists of stator and rotor. The stator winding is used as the primary side of the transformer and receives the excitation voltage, the excitation frequency is usually 400, 3000, 5000HZ and the like, the rotor winding is used as the secondary side of the transformer, and the induced voltage is obtained through electromagnetic coupling.
In an excitation conditioning circuit provided in an embodiment of the present invention, the excitation conditioning circuit includes: when the digital signal processor 100, the passive filter circuit 200 and the active filter circuit 300 are used, when in use, the digital signal processor 100 is used for outputting a signal after a sine wave is compared with a triangular wave, the signal is firstly filtered by the passive filter circuit 200, then phase advance compensation and voltage amplification are carried out by the active filter circuit 300, and finally the signal is input to the rotary transformer 400, compared with the traditional circuit, the active filter circuit 300 is additionally arranged behind the passive filter circuit 200 in the application, so that the functions of filtering enhancement and anti-interference capability are realized, meanwhile, the active filter circuit 300 can compensate the phase delay of the signal, the precision of a rotating speed sampling signal is improved, in addition, the digital signal processor 100 is used for comparing the output square wave by using the output sine wave and the triangular wave, a rotary-change decoding chip is saved, and the manufacturing cost is effectively reduced, the excitation conditioning circuit has the advantages of strong integral signal anti-interference capability, stable signal, small ripple wave, by forming good feedback characteristic near the virtual axis in the circuit phase frequency characteristic and even moving to the virtual axis to form oscillation, the pole of the traditional one-stage passive filter circuit can only be on the negative real axis, therefore, the excitation conditioning circuit provided by the embodiment of the utility model effectively solves the technical problems that in the prior art, a sine wave is output by an excitation conditioning circuit of a motor controller generally by adopting a decoding chip (such as a decoding chip with the model number of ADS 1205), then the sine wave is amplified by reverse voltage and filtered by an RC low-pass current, and finally the sine wave is input to a rotary transformer by a power amplifying circuit, the anti-interference capability of the excitation conditioning circuit is poor, and the phase delay caused by the RC filtering is not considered, so that the rotating speed sampling precision is influenced.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the utility model. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (5)
1. A stimulus conditioning circuit, comprising:
a digital signal processor;
the input end of the passive filter circuit is connected with the output end of the digital signal processor;
and the active filter circuit is connected with the output end of the passive filter circuit.
2. The excitation conditioning circuit of claim 1 wherein the passive filter circuit comprises a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, wherein the resistor R1, the resistor R2 and the capacitor C2 are sequentially connected in series, and wherein the capacitor C1 is connected in parallel with the resistor R1.
3. The excitation conditioning circuit of claim 1 wherein the active filter circuit comprises a second order active low pass filter circuit, a second order active high pass filter circuit, a second order active band pass circuit, and a second order active band reject circuit.
4. The stimulus conditioning circuit of claim 1, wherein the active filter circuit comprises an operational amplifier U1, a unidirectional input terminal of the operational amplifier U1 is connected to a first terminal of a resistor R4, a second terminal of the resistor R4 is connected to a resistor R3, a capacitor C3 is disposed between the resistor R3 and the resistor R4, a first terminal of the capacitor C3 is connected between the resistor R3 and the resistor R4, a second terminal of the capacitor C3 is connected to an output terminal of the operational amplifier U1, a first terminal of a capacitor C4 is further connected between the resistor R4 and the operational amplifier U1, an inverting input terminal of the operational amplifier U1 is connected to first terminals of the resistor R5 and the resistor R6, respectively, and a second terminal of the resistor R6 is connected to an output terminal of the operational amplifier U1.
5. The excitation conditioning circuit of claim 1 further comprising a rotary transformer, said rotary transformer being connected to an output of said active filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122667336.1U CN216411897U (en) | 2021-11-03 | 2021-11-03 | Excitation conditioning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122667336.1U CN216411897U (en) | 2021-11-03 | 2021-11-03 | Excitation conditioning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216411897U true CN216411897U (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122667336.1U Active CN216411897U (en) | 2021-11-03 | 2021-11-03 | Excitation conditioning circuit |
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| CN (1) | CN216411897U (en) |
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2021
- 2021-11-03 CN CN202122667336.1U patent/CN216411897U/en active Active
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